diff --git a/libraries/mogo-adas-data/src/main/proto/message_pad.proto b/libraries/mogo-adas-data/src/main/proto/message_pad.proto
index 21bc4568a5..c72d33a01e 100644
--- a/libraries/mogo-adas-data/src/main/proto/message_pad.proto
+++ b/libraries/mogo-adas-data/src/main/proto/message_pad.proto
@@ -141,7 +141,8 @@ message TrackedObject
     repeated Location polygon = 15;
     geometry.Point center = 16;
     AdditionalAttribute add_attribute = 17; // 事件类型
-    reserved 18 to 100;
+    double angle = 18; //相对于自车x轴的角度，左正右负
+    reserved 19 to 100;
     string strUuid = 101;//String类型车辆ID
 }